Feed collet



May 19, .1925. 1,538,442

J. A. MANN FEED COLLET Filed May 31, 1924 u INVENTOR.

. f. a gg;

A TTORNEY.

Patented May 19, 1925.

l Parent FFE I r moon A. MANN, ornn'rnortr, MICHIGAN, AssIGNon TO lean-sneer JANE MANN.

Application filed May'31g 1924i; Serial No. 717,162.

To ((-77 21:710.) it may concern:

lie it known that 1*, Jason A. hlir vn a citizen of the United States, residing at Detroit, in the county of lVayno and State of Michigan, have invented a newand use-- ful Feed Collct, vii which the following is a specification.

My invention relates to improvements in feed collets used in automatic screw machines and the like, and is intended for gripping and feeding, forward work not otherwise held. One of the objects being to provide a feed collet with a gripping surface of reduced diameter intermediately of its length, in which circumferential spring tension is provided from both ends of the collet.

A further object of my invention is to so design a feedcollet that the distance from the front end of the gripping surface to the front of the collet may be reduced to a minimum. v

Heretofore it has been customary either to provide a plurality of slots in a feed collet extending right to the front in which case it has only been possible to obtain spring tension from one end of the collet, or else to supply a front collar of circumfereutially closed diameter, in the latter case it is necessary to provide a gradually tapered portion of. some considerable length between the gripping surface and the closed collar in order to provide sufficient spring tension for the front portion of the gripping surface. In the present invention spring is obtained both from the closed threaded end, and from the front split coller, in addition to which the construction provides for a minimum of distance from the front of the gripping surface to the split collar, so thatshorter pieces of stock:

can be fed into a machine than by a oollet with a circumferentially closed front end.

With these and other objects in View the invention is hereafter more fully described with the aid of the accompanying drawings and claims.

Figure 1 shows a side elevation and Figure 2 an end levation of one form of my invention.

Figure 8 is a side View and Figure tan end view ofa slightly modified form of my feed collet.

Referring more particularly, to the drawings, 1 designates the toilet which is made of. one piece of circular material, preferably seamless tubing, one end of which is thread- 7 ed externally at 2 so as to'provide means for attaching the collet to the operating member therefor. In the collet 1 I supply an intermediate body portion 3 of reduced diameter. through which are cut a plurality of longitiulinal slots 4:, and one slot 5, which extends through the front collar 6, which is integral with and forms a portion of my 7 feed collet 1.

Between the rigid threaded end 2and the i is short and abrupt, because the slot 5 by which the collar 6 is severed permits of this without impairing the spring tension of the front part of the intermediate portion 3. It is also found in practice thatwith the collar 6 and the intermediate body portion 3 properly tempered, the collct will retain its resiliency for a considerable length of time without becoming distorted.

The slots e and 5 are so spaced that work of various forms of cross section may beheld. The two most usual arrangements of slots are shown in the drawings. Figures 1 and 2 show a feed collet with six slots adapted to grip either round or hexagonal work, and Figures 3 and 4: show a feed collet with four slots for gripping either round or square work. I

From the foregoing the utility of my device can readily be seen, it is understood that whereas the preferred embodiment of my invention has been described and .illus" trated, I may make alterations in the construction provided the said alterations fall within the scope of what Iclaim.

What I claim is:

1. A feed collet comprising a tubular member threaded externally at one end which is circumferentially closed, a gradually tapered connection extending from said closed end to anintermediate body portion of reduced diameter, and an abrupt change of diameter between said intermediate body portion and a frontcollar, said intermediate body portion being pierced by a plurality of longitudinal slots, one of said slots also being xtended through and splitting said collar.

2. A feed collet comprising a tubular member threaded externally at one end which is circumferentially closed, a granally ta; ered connection extending from the cireumferentially closed end to an intermediate body portion of reduced diameter, said tapered connection and said intermediate body portion being pierced longitudinally by slots, and a front split collar.

3. A. feed collet comprising a tubular member threaded externally at one end which is circumferentially closed, a gradually tapered connection extending therefrom to an intermediate body portion of reduced diameter said intermediate body portion and said tapered connection pierced by longitudinal slots, one of which extending said body portion pierced by longitudinal slots, an abruptchange of diameter between said reduced body portion and a collar through which latter one of said longitudinal slots extends.

In testimony whereof I atl'ix my signature in the presence of two witnesses at Majestic Building, Detroit, Michigan.

JACOB A. MANN.

Witnesses lvlnnnion G. ViNon, GERALD S. BALDWIN. 

